Percent of Change and Percent of Error Practice

Front

What is Percent of Change?

Back

Percent of Change is a measure that describes how much a quantity has increased or decreased in relation to its original amount, expressed as a percentage.

Front

How do you calculate Percent of Change?

Back

Percent of Change = ((New Value - Original Value) / Original Value) x 100.

Front

What is Percent of Error?

Back

Percent of Error is a measure of how inaccurate a measurement is, expressed as a percentage of the true value.

Front

How do you calculate Percent of Error?

Back

Percent of Error = (|Estimated Value - Actual Value| / Actual Value) x 100.

Front

If Sam thinks a book costs $50 but it actually costs $56, what is his percent of error?

Back

10%.

Front

If Mary thinks an umbrella costs $60 but it actually costs $50, what is her percent of error?

Back

20%.

Front

If Connie thinks she types 39 words/minute but actually types 56 words/minute, what is her percent of error?

Back

30.36%.

Front

What was the percent of change in attendance if last year 2,376 people attended and this year 2,950 attended?

Back

Increase 24%.

Front

If 72 people got speeding tickets one week and 36 the next week, what is the percent of change?

Back

Decrease 50%.

Front

What does a positive percent of change indicate?

Back

A positive percent of change indicates an increase in the quantity.